Classification of Elements and Periodicity in Properties

Consider the following sets of quantum numbers:

• ii, iii and iv

• i, ii, iii and iv

• ii, iv and v

• ii, iv and v

With which of the following electronic configuration an atom has the lowest ionisation enthalpy? 

• 1s² 2s²2p⁵

• 1s² 2s²2p³

• 1s² 2s²2p⁵ 3s¹

• 1s² 2s²2p⁵ 3s¹

Identify the correct order of the size of the following:

• Ca²⁺ < K⁺<Ar < S^2- < Cl^-

• Ca²⁺ < K⁺ < Ar < Cl^-< S^2-

• Ar < Ca²⁺ <K⁺ <Cl^- <S^2-

• Ar < Ca²⁺ <K⁺ <Cl^- <S^2-

The element Z = 114 has been discovered recently. It will belong to which of the following family group and electronic configuration?

• Halogen family, [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵

• Carbon family, [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p²

• Oxygen family,[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁴

• Oxygen family,[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁴

Choose the incorrect statement about noble gas?

• Boiling point increases with increasing atomic mass

• Helium has least tendency to form compound

• Noble gases have some value of electron affinity

• Xenon has maximum number of compounds

Beryllium differs in properties from other elements of its own group but shows resemblance with aluminium because of

• relatively bigger ionic radius and high polarising power of Be

• relatively smaller ionic radius and high polarising power of Be

• relatively bigger ionic radius is the only reason behind this

• None of the above

Which of the following pair of metals is purified by van- Arkel method?

• Zr and Ti

• Ag and Au

• Ni and Fe

• Ga and In

Which of the following is correctly arranged in order of increasing weight?

• 0.0105 equivalent of H₂CO₂ ·2H₂O < 0.625 g of Fe < 0.006 g atom of Ag <6.0 x 10²¹ atoms of Zn

• 0.625 g of Fe < 0.0105 equivalent of H₂C₂O₄ ·2H₂O < 6.0 x 10²¹ atoms of Zn < 0.006 g atom of Ag 

• 0.625 g of Fe < 6.0 x 10²¹ atoms of Zn < 0.006 g atom of Ag < 0.0105 equivalent of H₂C₂O₄ ·2H₂O

• 0.0105 equivalent of H₂C₂O₄. 2H2O < 0.006 g atom of Ag <6.0 x 10²¹ atoms of Zn < 0.625 g of Fe

A student made the following observations in the laboratory.

I. Clean copper metal did not react with 1 molar Pb(NO₃)₂ solution

II. Clean lead metal dissolved in a 1 molar AgNO₃ solution and crystals of Ag metal appeared

III. Clean silver metal did not react with 1 molar Cu(NO₃)₂ solution

The order of decrease in reducing character of three metals is

• Pb, Cu, Ag

• Pb, Ag, Cu

• Cu, Ag, Pb

• Cu, Pb, Ag

A number of elements available in earth's crust but most abundant elements are

• Al and Fe

• Al and Cu

• Fe and Cu

• Cu and Ag